Try to submit it on top websites like slideshare, scribd, authorstream etc and your intention should be to get referral visitors from those site instead of getting links. I do not see any problem if you submit the PPT on 4-5 websites.

You can submit same doc to 10 or 20 doc sharing sites. If you want, you can make the documents unique by introducing tiny changes like changing the images you add to each document or something. I offer this kind of service to clients and I usually create one document and submit to many doc sharing sites for them.

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